package main

import "fmt"

func main(){
	var c1, c2, c3 chan int
	var i1, i2 int
	select {
	case i1 = <-c1:
		fmt.Printf("received", i1, "from c1\n")
	case c2 <- i2:
		fmt.Printf("sent",i2, "to c2\n")
	case i3,ok := (<-c3):
		if ok{
			fmt.Printf("received",i3, "from c3\n")
		} else{
			fmt.Printf("c3 is closed\n")
		}
	default:
		fmt.Printf("no communication\n")
	}

}